Differences

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--- ve.bus:manual_parallel_and_three_phase_systems [2026-02-11 10:24] – Added information about compatibility ids jpasop
+++ ve.bus:manual_parallel_and_three_phase_systems [2026-03-04 09:34] (current) – [Communication wiring] guy_stewart
@@ Line 16: / Line 16: @@
 ===== Compatibility IDs explained =====
-The **compatibility ID** denotes which devices can be combined in a single system.\\ This ID can be found on the stickers of the units.<sup>1)</sup>\\ A compatibility ID consists of a 4-digit number followed by a letter. (e.g. 2623_B)\\ VE.Bus systems can only be made with devices with identical 4-digit numbers and only devices with the same letter can be put in a single phase.\\
+The **compatibility ID** denotes which devices can be combined in a VE.Bus system.\\ This ID can be found on the stickers of the units.<sup>1)</sup>\\ A compatibility ID consists of a 4-digit number followed by a letter. (e.g. 2623_B)\\ VE.Bus systems can only be made with devices with identical 4-digit numbers and only devices with the same letter can be put in a single phase.\\
     * Make sure that the 4-digit number in the compatibility ID of all units in the VE.Bus system is identical .
     * Make sure that units in a single phase (so parallel units) have an identical letter in the compatibility ID.
 <sup>1)</sup> If there is no compatibility ID on the sticker then the compatibility ID consists of the first 4 digits of the complete firmware number followed by the letter **A**.\\ The one exception to this rule is firmware 2699xxx: If there is no compatibility ID on the sticker then the compatibility ID is 26**2**9_A (instead of 26**9**9_A).
+Note: The 4-digit number in the compatibility ID does not necessarily represent the firmware version of the unit itself. For instance a MultiPlus-II 24/5000/120-50 could require firmware version 2696xxx while the compatibility id sticker on that unit shows 2615_B.
 ===== Warning =====
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 ===== Communication wiring =====
-  * All units must be daisy chained with the VE.Bus cable (RJ-45 cat5). The sequence for this is not important. Do not use terminators in the VE.Bus network.
+  * All units must be daisy chained with the VE.Bus cable (RJ-45 Cat5 or better). The sequence for this is not important. Do not use terminators in the VE.Bus network.
   * The temperature sensor can be wired to any unit in the system. For a large battery bank it is possible to wire multiple temperature sensors. The system will use the one with the highest temperature to determine the temperature compensation.
   * Wire the voltage sense on the master of L1.\\ (If the system has more than 1 AC input, connect it to the Master corresponding to the first AC input.) \\ All other units ignore their voltage sense input and receive the voltage sense value from the L1 master.
+  * [[https://www.victronenergy.com/live/ve.bus:ve.bus_network_interference|Further information on best practices for VE.Bus wiring]], can help with reducing VE.Bus errors caused by interference as system size increases.
 ===== Configuration =====